Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 a45df331c681b7e7…

MALICIOUS

Office (OOXML) / .XLSM

101.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2f6355c790b4b13df09de370bb6a4d53 SHA-1: 368b723e4dc95001b17dc792143ffa5bac95b96b SHA-256: a45df331c681b7e73faf94527cd19a9de28e7f0aa10556a18cb48f7db685ce87
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

This XLSM file contains VBA macros, including an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The script explicitly calls URLDownloadToFileA to download a payload from one of the embedded URLs, such as http://190.14.37.25/. The presence of Excel 4.0 macro sheets further indicates malicious intent. The ClamAV detection name 'Xls.Downloader.Docusign112101-9908076-0' also points to a downloader functionality.

Heuristics 8

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • ClamAV: Xls.Downloader.Docusign112101-9908076-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Docusign112101-9908076-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://190.14.37.25/
    • http://51.89.115.101/
    • http://176.126.113.167/
    • http://190.14.37.25/�
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
37e4e887bb3ed27eea2797b3dfedc4e5b0040cf814d2883b4c7bbef6f6d93842		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2670 bytes
vbaProject_00.bin
b56ec00af705253afcae3e8d0bfeeda3e6335598722ac30ea90522666c98ec00		 vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_00.xml
cfc7398f1c5e030893e4f32c18d2d5dd4ee80902bd65e2430497fbdc1a76aad0		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1515 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.